Products Description
Our Advantages
1. Pressure Resistance
- Our large-diameter pipes are seamless stainless steel pipes manufactured using a hot extrusion process. They feature uniform wall thickness and overall strength significantly higher than hot-expanded and welded pipes, resulting in superior safety performance.
- The pipes undergo eddy current testing and ultrasonic testing to ensure they are free from internal defects, surface cracks, and weak points, making them suitable for use in the oil, gas, and petrochemical industries.
2. Corrosion Resistance
- The large diameter stainless steel pipe undergoes an acid-washed surface treatment to enhance corrosion resistance. Each pipe undergoes intergranular corrosion testing and salt spray testing to ensure its durability.
- We offer pipes with different corrosion resistance grades, including 304, 316, 321, and 2205, suitable for various corrosion-resistant applications. The pipes undergo solution heat treatment to prevent intergranular corrosion at high temperatures.
3. High Dimensional Accuracy
- The large diameter stainless steel pipe undergoes sizing and straightening treatment using specialized equipment to ensure an outer diameter tolerance of ±0.35mm and consistent roundness.
- Each batch of our pipes undergoes rigorous dimensional testing to ensure compliance with ASTM A312 standards and compatibility with flanges, fittings, and valves.
4. Customization Capabilities
- TORICH offers flexible customization services for outer diameter, wall thickness, and other dimensions, with outer diameters up to 1000mm. A wide range of sizes is available to meet the needs of diverse customers.
- We can provide corresponding materials based on actual customer requirements and support customized heat treatment, beveling, end face finishing, internal and external polishing, pickling and passivation, marking, and other customized processing services.
application areas
The following are applications for seamless stainless steel pipe in the oil and gas industry:
- Offshore platforms and subsea pipelines for transporting crude oil, natural gas, and process fluids.
- Refinery piping systems for handling corrosive process media.
- Heat exchangers and condensers.
- Seawater desalination and injection systems.
- Onshore oilfield equipment.
Chemical Composition
| Element | C (max) | Mn (max) | Si (max) | P (max) | S (max) | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| 304 | 0.08 | 2.00 | 1.00 | 0.045 | 0.03 | 18.0–20.0 | 8.0–11.0 | - |
| 309H | 0.20 | 2.00 | 1.00 | 0.045 | 0.03 | 22.0–24.0 | 12.0–15.0 | - |
| 316 | 0.08 | 2.00 | 1.00 | 0.045 | 0.03 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| 304 | ≥520 | ≥205 | ≥40 | ≤201 |
| 309H | ≥585 | ≥260 | ≥40 | ≤217 |
| 316 | ≥515 | ≥205 | ≥40 | ≤217 |
Possible Alternative Grades
| Alternative Grades | Reasons |
| 316L | Provides improved weldability and resistance to intergranular corrosion. |
| 317L | Higher molybdenum content for greater resistance to pitting corrosion. |
| 347H | Niobium-stabilized grade offers high-temperature strength and oxidation resistance. |
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is hot extrusion?
A: Hot extrusion is a manufacturing process that involves heating a solid stainless steel billet and then extruding it through a die to form a seamless tube. The final product has a truly seamless structure, and the mechanical properties and corrosion resistance are uniform throughout the tube.
Q: Why are your tubes more reliable in terms of pressure resistance?
A: The tubes are manufactured using a hot extrusion process, ensuring uniform wall thickness, high concentricity, and non-concentrated stress. Each tube also undergoes hydrostatic testing and non-destructive testing.
Q: Can you provide customized surface treatments and final machining services?
A: Yes, we offer surface treatments such as pickling and passivation, mechanical polishing, and electrolytic polishing, as well as machining processes such as beveling and sizing.
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